The Nasmyth telescope, also called Nasmyth-Cassegrain, is a reflecting telescope developed by James Nasmyth.
Hartop Holt, and much of its cost was provided by his aunt, the widow of the engineer James Nasmyth.
Attracted to astronomy by the influence of James Nasmyth, he constructed in 1850 a 13-inch reflecting telescope, mounted first at Canonbury, later at Cranford, Middlesex, and with its aid executed many drawings of the celestial bodies of singular beauty and fidelity.
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Many outstanding engineers trained in his workshop, including Richard Roberts, David Napier, Joseph Clement, Sir Joseph Whitworth, James Nasmyth (inventor of the steam hammer), Joshua Field and William Muir.
He was born in London, the son of James Nasmyth Wallinger and Marian Collier, and was educated at the King's College School in London and the Royal Agricultural College.